Answer:
Radius is a segment from a point on the circle to the center of the circle.
B is correct.
Explanation:
Radius of a circle is unique identification of any circle.
It start from centre and end at any point on circle.
It is a segment from a point on the circle to center of the circle.
Radius is half the length of diameter of circle.
Diameter is a line which start from one point on circle to end another point on circle but passes through the center of circle.
So, The segment of diameter is double the radius.
Hence, Radius is a segment from a point on the circle to the center of the circle.